Saw-sharpening machine



No Mode 1.) 2 Shets-Sheet 1@ B. F. SHEETS. SAW SHARPENING MACHINE.

No. 460,462. Patented Sept. 29, 1891.

(No Model.) 2 Sheets-Sheet 2'.

B. F. SHEETS.

SAW SHARPENI-NG MACHINE.

No. 460,452. Patented Sept. 29, 1891.

l I l f Z I: I I E IIHIHII 1| I, l I w 1 L; H I "w I 0 %Z 7Z5668 Jnwn'zmm: NORRIS vs'regs co., mom-mm, WASHINHTON, u. c.

, ing from one tooth to another.

of the same.

UNITED STATES PATENT OFFICE.

BENJAMIN F. SHEETS, OF MUSKEGON, MICHIGAN.

SAW-SHARPENING MACHINE.

SPECIFICATION forming part of Letters Patent No. 460,452, datedSeptember 29, 1891.

Application filed January 29, 1891- Serial No. 379,607. (No model.)

To all whom it may concern:

Be it known that I, BENJAMIN F. SHEETS, a citizen of the United States,residing at Muskegon, in the county of Muskegon and State of Michigan,haveinvented certain new and useful Improvements in Saw-SharpeningMachines; and I do hereby declare the following to bea full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same.

This invention relates to an improvement in automatic saw-sharpeningmachines for sharpening saw-teeth, the object of the invention being toprovide a machine in which the several parts thereof shall be soarranged as to communicate motion between them of such a delicate naturethat teeth of any desired form can be ground and finished by theemery-wheel without the necessity of subsequently filing off theWire-edge from every tooth, as is necessarily the case with thosemachines now in common use, thus effecting not only a superiorcombination of movements, but also a great saving of time and labor inmanipulating the machine while in motion; and it consists in thearrangement and construction of the several parts which regulate thevertical movement of the emerywheel and the horizontal movement of thefinger which regulates the throw of the saw when changing from one toothto another; and, further, it comprises certain details in theconstruction, arrangement, and combination of parts, substantially aswill be hereinafter described and claimed.

In the accompanying drawings, illustrating niyinvention, Figure l is afront elevation of a portion of asaw-sharpening machine, show ing myimprovements applied thereto. Fig. 2 is an enlarged plan view of thefinger which regulates the throw of the saw when chang- Fig. 3 is a sideelevation of the same. Fig. 4 is an enlarged side elevation of the lowerstraight slide-link which operates the emery-wheel. Fig. 5 is a planview of the same. Fig. 6 is an enlarged side elevation of the uppercurved slide-link which operates the arm to which the finger isattached. Fig. 7 is a plan view. Fig. 8 is an end view of the same.

Similar letters of reference designate corresponding parts throughoutall the different figures of the drawings.

In machines as now constructed when large saws are being sharpened theperiphery of 1 wheels for operating the several parts being clear of theteeth of the largest saw, changes can be made without danger while themachine is in motion. It is impossible in the old machines to effect thechanges on the links without stopping the machine, and thus cansing alarge loss of time and labor.

A A denote the side portions of the frame of my improved saw-sharpeningmachine, B B the center girts, and C the top portion of the frame.

D denotes the frame, and d the slide for carrying the emery-wheel d.

E is the cam which communicates motion to all of the levers. On thelever e, which is fulcrumed at one end of the frame A, is provided aroller 6. To the opposite end of this lever e is pivoted the rod F,which connects at its lower end with the link K. These levers givemotion to the vertical rod f, which operates the emery-wheel slide d. Tothe lower end of the rod f is attached a hollow tube G, in which worksthe rod Z of the forked lever L, which is connected to the arm K.

H is a horizontal rod communicating motion to the curved arm N, and h isthe connectingrod between the arm N and the finger-lever h. The rod h isprovided with a right and left hand screw-nutU for regulating its lengthso as to adjust the position of the finger. The lower portion of thelever 71/ is pivoted to the cross-bar B of the main frame.

I is a rest, which projects outwardly from the top of the main frame,and on which the finger S slides.

The parts just described are thesame as those now in common use inmachines of this class, and I make no claim to the same.

K represents m yimproved lower arm or link, enlarged detail views ofwhich are shown in Figs. at and 5. This link is provided with alongitudinal slot K of the requisite length.

To one end of this link the rod F is pivoted, (see Fig. 1,) while theother end of the arm K is pivoted to the frame B by means of the boltis.

L is a double jaw or fork straddling the arm or link K, the upperportion of which is a round rod Z, extending some considerable distanceinto the tube G. In this jaw the screwnut Z is held, and is kept inplace by a nut on the opposite side of the fork. The body of the nut Z,which is round, is enveloped in a thimble Z which fits neatly in theslot K. Thisnut Z is capable of changing its position as it is movedalong the slot by the screw M. This screw M is provided near the hub ofthe link with a double collar M.

m is ayoke or journal-box securely fastened to the link K by a nut orotherwise. -The screw M, being journaled in this box, is kept inposition by the double collars h and also by a pin M extending throughboth jaws of the yoke m.

'm' is a hand-wheel secured to the end of the screw for working thesame.

N represents my improved curved arm or link, enlarged detail views ofwhich are shown in Figs. 6, '7, and S. It is provided with the properlength of slot N for operating the machine, and also with thescrew-threaded rod or, provided with the double collars n and handwheel17?. To accommodate the present style of machines, this link isfulcrumed on the part 0 of'the main frame by means of the stem of theyoke O and its surrounding sleeve. Between the part 0 of the frame andthe link is a square collar 0 Through arm N, collar 0 and frame 0'passes a sleeve 0 having a square head on one end and a threaded nut 11on the other end, which secures this arm N solidly to the frame,allowing only sufficient play between the two collars P and o to permitthe link to work easily on its fulcrum. In this sleeve 0 is the stem ofthe yoke O, which is provided on its outer end with the nut 13. Thisyoke is not rigid, but changes its position relatively with the angle ofthe screw. Other means of constructing this yoke may be provided withoutdeparting from the spirit of my invention so long as it is made movable.

Q is a threade movable nut fastened to a yoke on the rod 71, (see Fig.1,) and is constructed in the same manner as yoke L in Figs. 4: and 5.To the end of this arm or link N is attached the rod H, which receivesits motion from the power-cam E. (See Fig. 1.)

R is a frame pivoted to the upperend of the lever h by the boltr, andoscillates thereon. This frame is provided with a slot 7" long enough toallow the proper travel of the finger S. (See the enlarged views inFigs. 2 and 3.) The upper portion of the finger, which constitutes aslide, is provided on the upper face with the boxes 8 and s, threaded toreceive the screw T. This screw-rod is also provided with double collarsand ahandwheel, as shown in Figs. 2 and 3, and is fulcrumed to thedouble j aw end B of the frame R and kept in place by a suitable pin RThe screw-rod T, being screwed into the threaded boxes 3 and 8', movesthe finger laterally back and forth as far as desired. The bolt t nearthe end of the slot 7" keeps the finger from rising up while working,but has clearance enough to allow its travel with the finger in itsmotion either way.

In my arrangement the rod h can be made plain, dispensing with the rightand left hand nut U, if desired, providing lateral movement in the leverh by means of a series of holes 7L2, formed in the lever h.

I11 adjusting machines as now in common use the links K and N are notprovided with a screw-movement, but have holes drilled in them atsuitable distances apart for adjustment with a pin, and to the upper endof the lever h is attached merely a finger pivoted thereto by means of apin. The adjustment of the finger is necessarily accomplished by meansof the right and left hand nut U. (See Fig. 1.) It will be evident thatwhile the machine is in motion this is a dangerous proceeding, and mightresult in an accident by reason of the operator shortening the rod whenit ought to be lengthened, or vice versa. It will be evident to thoseskilled in the art that by the use of my improved method of screwadjustment I overcome the existing defects in this class of machines,accomplishing any change of movement while the machine is in motion,thereby saving considerable time in the sharpening of saws, obtainingmore perfect results therefrom in the formation of the tooth, and nofeather-edge is left on the tooth to be subsequently filed off. By thisarrangement of links or arms adjustments will always be exact andpositive, and a great deal of time is saved and danger avoided. Bymanipulating the hand-wheel of the link K the emery-wheel is adjustedfor different saws, according to the required depth of the teeth. Theemery-wheel gate is supported in a suitable guide-frame, which has aslightlyinclined movement, as shown in Fig. 1, by means of which theemery-wheel is brought into contact with the teeth of the saw in such amanner as to impart a fine sharp point to the same, and the requiredmotion is given to the emery-wheel and arbor on which it is mounted by abelted connection with a suitable band-pulley mounted at the backportion of the machine. (Not shown.)

The feed-finger may be set as desired, so as to give the emery-wheel alight or heavy cut on the teeth by means of the right and left hand nutU on the rod 71.

The leverage connections and other parts of the machine are notdescribed here, as they are the same as those now in common use, myinvention residing simply in the improved construction of slide-linksfor operating the same.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. In a saw-sharpening machine, the combination, with the main frame, ofsuitable arms or links for regulating the cut and depth of thesaw-teeth, having adjustable screw devices and means for operating thesame, substantially as described.

2. In a saw-sharpening machine, the combination, with the main frame, ofthe lower arm or link fulcrumed at one end to the main frame and at theother end to a connectingrod, said arm being provided with alongitudinalgroove, in which one end of a screw-nut works, and also with a jaw oryoke carrying the screw-rod, having attached. to it a handle foroperating the same, and a connection between the screW-nut and thegrinding-Wheel, substantially as described.

3. In a saw-sharpening machine, the combination, with the main frame andthe connectingmods, of the lower arm or link K, supported on the mainframe by the bolt k and provided with the longitudinal slot K, carryinga thimble P, the screw-nut- Z, running through the yoke L and thimbleand secured at one end by means of a suitable nut, the yoke m, andcollars M, the screw-rod M, secured in said yoke and operating thescrewnut Z, and the handle for operating said rod M, all substantiallyas described.

4. In a saw-sharpening machine, the combination, with the main frame andthe connecting-rods, of the upper curved arm orlink having alongitudinal slot therein, said arm being secured movably in position bymeans of the yoke O and its surrounding sleeve, and the screw-nutworking in the longitudinal slot, substantially as described.

5. In a saw-sharpening machine, the com-.

bination, with the main frame and the connecting-rods, of the uppercurved arm N, having a longitudinal slot N therein, the threaded nut Q,partly surrounded by a suitable thimble working in said slot, collars Pand 0 and sleeve 0 the yoke O and collars n, and the screw-rod at, saidscrew-rod passlng through the collars a and nut Q and operated by meansof a hand-Wheel n substantially as described.

-6. In combination with the levers h and h and arm N for operating thefinger-lever, the finger-frame R, provided with a suitable finger andthe screw-rod for operating the same, said lever 7t being provided withperforations 71 therein, substantially as described.

7. The finger-frame R, provided With a slot 4*, the finger S, havingscrew-threaded boxes 5 and s, the screw-rod T, working in said boxes,the bolt 75 for keeping the finger in proper position, and the band-wheel for operating said screw rod, substantially as described.

8. The combination of the finger-frame R, pivoted to the lever-h' bymeans of the bolt 7', the finger S, having the screw-boxes s and s, thedouble jaw or yoke R, provided with collars R for supporting thescrew-rod, the screw-rod T, working in boxes .9 and s, the hand-wheelfor operating said screwrod, and the boltt for keeping the finger-slidein position, substantially as described.

9. In a saw-sharpening machine, the combination, with the emery orgrinding wheel and a finger carried by a finger-lever, of the pivotedarm or link having an adjustable nut which is connected by aconnecting-rod with the finger-lever, the pivoted arm or link having anadjustable nut which is connected by a connecting-rod with thegrinding-frame. and suitable connecting-rods which connect the free endsof the said arms or links, with means for moving the same, substantiallyas described.

In testimony whereof I affix my signature in presence of two witnesses.

BENJAMIN F. SHEETS. Witnesses:

ROBERT WEIR, A. A. H. ECKERMANN.

